package com.example.book.common.utils;

import org.apache.commons.codec.binary.Hex;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA256 {


    public static String SHA256Str(String str) {

        MessageDigest messageDigest;

        String encdeStr = "";

        try {

            messageDigest = MessageDigest.getInstance("SHA-256");

            byte[] hash = messageDigest.digest(str.getBytes("UTF-8"));

            encdeStr = Hex.encodeHexString(hash);

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

        return encdeStr;

    }


    public static String getSHA256Str(String str) {

        System.out.println("加密的参数：" + str);

        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes("UTF-8"));
            encodeStr = byte2Hex(messageDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encodeStr;
    }

    private static String byte2Hex(byte[] bytes) {
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i = 0; i < bytes.length; i++) {
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length() == 1) {//1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

    public static void main(String[] args) {
        String res = "{\"randomStr\":\"55afce56-2e97-464e-82a2-ab1333abb800\",\"timestamp\":1575896691361}93f87180c67a4b759ab42606d813a3c3";
        System.out.println(getSHA256Str(res));
    }
}
